GOP lawmakers, especially those from agriculture-heavy states, have two major complaints with the administration.

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They feel it is not listening to Congress’s feedback on negotiations with Mexico and Canada over the future of the North American Free Trade Agreement (NAFTA). Trump has threatened to withdraw the U.S. from NAFTA.

They’re also frustrated by what they see as a total lack of progress in negotiating the bilateral trade agreements with Pacific Rim countries that Trump promised after pulling out of the Trans-Pacific Partnership (TPP) in January.

“There’s a number of frustrations with their approach including — as I’ve told the ambassador before — they need Congress to ratify it under [Trade Promotion Authority (TPA)] and so they don’t seem to be paying that much attention to what members of the Senate think,” Cornyn said.

TPA gives the administration authority to negotiate on trade deals. Congress, under the TPA law, has the authority to review any proposed U.S. trade agreement and decide whether it will be implemented.

“Members are frustrated the administration isn’t regularly consulting with them during NAFTA negotiations as they’re obligated to under TPA,” said a Senate Republican aide.

GOP lawmakers are worried that altering trade relations with Canada and Mexico too drastically could rattle the economy and wipe out the stimulative punch of the tax-cut package Trump just signed into law.

Texas, for example, relies heavily on trade with Mexico. It exported $92 billion in goods to Mexico in 2016, according to the International Trade Administration.

“It would be a paradox of enormous irony if here we’re passing a tax bill to achieve economic growth and on the other side of it pulling the trigger on NAFTA — if the president would do that — could very well cause a farm recession and a stock market reaction that would be very counterproductive,” Roberts said.

Talks with Mexico and Canada grew tense over the fall when the Trump administration suggested replacing NAFTA with a new agreement that would sunset after five years.

Hatch said “weakening NAFTA would be detrimental to the U.S. and Utah’s economy."

The U.S. Trade Representative press office did not respond to a request for comment Friday.

GOP lawmakers are also growing exasperated over the lack of progress in replacing the Trans-Pacific Partnership.

Trump transition officials signaled to lawmakers and the media a year ago that the administration would have new deals in place very quickly to replace the TPP, which went forward without the United States.

“You will be shocked by the speed at which bilateral agreements begin to materialize,” a Trump transition adviser told Reuters in January.

But Roberts said “I don’t think there’s been much planning on it.”

Lighthizer has tried to reassure the Kansas Republican by telling him that “there are some possibilities with Vietnam” that the administration is exploring.

“If you do one by one, that takes a lot of time and a lot of effort and we could have had a joint TPP, where you have trade with a country, you plant the American flag and they know you have their back. They don’t want to do any business with China,” Roberts added.

He said Australia and Japan are now taking U.S. business opportunities with other Pacific countries.

Roberts said the lack of work on bilateral trade deals can be explained by the administration’s focus on renegotiating NAFTA and the slow pace of confirming key officials to the trade representative's office.

Other Republicans who played key roles in the tax-reform debate say they’re also worried about the cloud that Trump’s trade policy is casting over the economy.